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<title>button exercise</title>
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 <p><code>&lt;header&gt;</code>作为内联元素被包围</p>
 <p>如果想要把代码先试为一个独立的块元素，请使用 &lt;/pre&gt;</p>
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    &lt;article&gt;
	  &lt;h1&gt;Article Heading&lt;/h1&gt;
	&lt;article&gt;
 </pre>
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